katydid


From The Collaborative International Dictionary of English v.0.48:

Katydid \Ka"ty*did`\, n. (Zool.)
   A large, green, arboreal, orthopterous insect ({Cyrtophyllus
   concavus}) of the family Locustid[ae], common in the United
   States. The males have stridulating organs at the bases of
   the front wings. During the summer and autumn, in the
   evening, the males make a peculiar, loud, shrill sound,
   resembling the combination Katy-did, whence the name.
   [1913 Webster]
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